Seat and back rest for a chair



FIG. 1 is a perspective view showing the top, left side and front of a seat and back rest for a chair which form my new design, the broken lines in this and other figures showing other parts of the chair being for illustrative purposes only and forming no part of my design;

FIG. 2 is a perspective view showing the top, left side and rear thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof. 

The ornamental design for a seat and back rest for a chair, as shown and described. 